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      1 // Copyright 2014 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifndef CONTENT_BROWSER_ANDROID_JAVA_GIN_JAVA_METHOD_INVOCATION_HELPER_H_
      6 #define CONTENT_BROWSER_ANDROID_JAVA_GIN_JAVA_METHOD_INVOCATION_HELPER_H_
      7 
      8 #include <map>
      9 
     10 #include "base/android/jni_weak_ref.h"
     11 #include "base/android/scoped_java_ref.h"
     12 #include "base/memory/ref_counted.h"
     13 #include "base/values.h"
     14 #include "content/browser/android/java/gin_java_bound_object.h"
     15 #include "content/browser/android/java/java_type.h"
     16 #include "content/common/android/gin_java_bridge_errors.h"
     17 #include "content/common/content_export.h"
     18 
     19 namespace content {
     20 
     21 class JavaMethod;
     22 
     23 // Instances of this class are created and used on the background thread.
     24 class CONTENT_EXPORT GinJavaMethodInvocationHelper
     25     : public base::RefCountedThreadSafe<GinJavaMethodInvocationHelper> {
     26  public:
     27   class DispatcherDelegate {
     28    public:
     29     DispatcherDelegate() {}
     30     virtual ~DispatcherDelegate() {}
     31     virtual JavaObjectWeakGlobalRef GetObjectWeakRef(
     32         GinJavaBoundObject::ObjectID object_id) = 0;
     33 
     34    private:
     35     DISALLOW_COPY_AND_ASSIGN(DispatcherDelegate);
     36   };
     37 
     38   class ObjectDelegate {
     39    public:
     40     ObjectDelegate() {}
     41     virtual ~ObjectDelegate() {}
     42     virtual base::android::ScopedJavaLocalRef<jobject> GetLocalRef(
     43         JNIEnv* env) = 0;
     44     virtual base::android::ScopedJavaLocalRef<jclass> GetLocalClassRef(
     45         JNIEnv* env) = 0;
     46     virtual const JavaMethod* FindMethod(const std::string& method_name,
     47                                          size_t num_parameters) = 0;
     48     virtual bool IsObjectGetClassMethod(const JavaMethod* method) = 0;
     49     virtual const base::android::JavaRef<jclass>& GetSafeAnnotationClass() = 0;
     50 
     51    private:
     52     DISALLOW_COPY_AND_ASSIGN(ObjectDelegate);
     53   };
     54 
     55   GinJavaMethodInvocationHelper(scoped_ptr<ObjectDelegate> object,
     56                                 const std::string& method_name,
     57                                 const base::ListValue& arguments);
     58   void Init(DispatcherDelegate* dispatcher);
     59 
     60   void Invoke();
     61 
     62   bool HoldsPrimitiveResult();
     63   const base::ListValue& GetPrimitiveResult();
     64   const base::android::JavaRef<jobject>& GetObjectResult();
     65   const base::android::JavaRef<jclass>& GetSafeAnnotationClass();
     66   const GinJavaBridgeError GetInvocationError();
     67 
     68  private:
     69   friend class base::RefCountedThreadSafe<GinJavaMethodInvocationHelper>;
     70   ~GinJavaMethodInvocationHelper();
     71 
     72   void BuildObjectRefsFromListValue(DispatcherDelegate* dispatcher,
     73                                     const base::Value* list_value);
     74   void BuildObjectRefsFromDictionaryValue(DispatcherDelegate* dispatcher,
     75                                           const base::Value* dict_value);
     76 
     77   bool AppendObjectRef(DispatcherDelegate* dispatcher,
     78                        const base::Value* raw_value);
     79 
     80   void InvokeMethod(jobject object,
     81                     jclass clazz,
     82                     const JavaType& return_type,
     83                     jmethodID id,
     84                     jvalue* parameters);
     85   void SetInvocationError(GinJavaBridgeError error);
     86   void SetPrimitiveResult(const base::ListValue& result_wrapper);
     87   void SetObjectResult(
     88       const base::android::JavaRef<jobject>& object,
     89       const base::android::JavaRef<jclass>& safe_annotation_clazz);
     90 
     91   typedef std::map<GinJavaBoundObject::ObjectID,
     92                    JavaObjectWeakGlobalRef> ObjectRefs;
     93 
     94   scoped_ptr<ObjectDelegate> object_;
     95   const std::string method_name_;
     96   scoped_ptr<base::ListValue> arguments_;
     97   ObjectRefs object_refs_;
     98   bool holds_primitive_result_;
     99   scoped_ptr<base::ListValue> primitive_result_;
    100   GinJavaBridgeError invocation_error_;
    101   base::android::ScopedJavaGlobalRef<jobject> object_result_;
    102   base::android::ScopedJavaGlobalRef<jclass> safe_annotation_clazz_;
    103 
    104   DISALLOW_COPY_AND_ASSIGN(GinJavaMethodInvocationHelper);
    105 };
    106 
    107 }  // namespace content
    108 
    109 #endif  // CONTENT_BROWSER_ANDROID_JAVA_GIN_JAVA_METHOD_INVOCATION_HELPER_H_
    110